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Fix a Treadmill

Treadmills are large pieces of exercise equipment that often accumulate a lot of use throughout the years. They're designed to withstand repeated impact, but, like all machines, they have the tendency to malfunction. Instead of buying a replacement when your machine acts up, consider fixing the problem yourself. Use these steps to troubleshoot treadmill problems

Plug the treadmill into a different outlet to eliminate the first outlet as the issue. If you know which outlets are on separate fuse circuits, try using an outlet that is powered by another fuse.
Plug another device into the treadmill's outlet to see if it works.
Examine the prongs on the treadmill's power plug to see if they are bent or distorted in any way.
Check the connections between your power adaptor and the equipment. Some models may need to be opened to complete this step

Spray a towel with cleaning solution and wipe down the belt. Begin at the top and tug the belt firmly to move it downward. Dirt and debris can collect on the belt, which can slow it down. Debris can also drop from the belt into the interior of the treadmill.
Adjust the belt so that it is directly in the center. Belts can stretch and begin to lean to one side after frequent use. You can try repositioning the belt from the outside of the treadmill by pulling gently away from the slanted side, but a technician should look at severe belt issues.
Lubricate the belt by spraying a towel with silicone lubricant. This reduces belt friction and can lengthen the life of the belt.
Replace the belt. Make sure it is the correct model for your treadmill

If the display console is flashing error codes, check these codes against the owner's manual. This should tell you where the motor is failing if it is failing.
Open the treadmill according to the manufacturer's instructions with a screwdriver. Inspect the motor's connections. For non-experts, inspecting a motor might be fruitless. If nothing strikes you as being obviously wrong, you might need to consult a professional.
Replace the motor. Treadmill motors can be purchased at exercise equipment outlets both online and in physical stores